A tweet from
PUBG Help informs PLAYERUNKNOWN'S BATTLEGROUNDS players that they the latest
PC anti-cheat patch for the Battle Royale Game has been rolled back (thanks
VG247). Word is in spite of its effectiveness, this was causing some users
compatibility problems:

PC players, despite its effectiveness in blocking
cheats, we have decided to roll back our latest live server update.

We will continue to resolve some compatibility issues caused by it. There will
be a small patch to download. We apologize for the inconvenience.